public Login()
{
InitializeComponent();
datos cn = new datos();
cn.conec();
sCn = cn.cadena;
conn = new SqlConnection(sCn);
}
public Grados()
{
InitializeComponent();
this.toolTip1.SetToolTip(this.pictureBox2, "Modificar");
this.toolTip1.SetToolTip(this.pictureBox3, "Eliminar");
this.toolTip1.SetToolTip(this.pictureBox1, "Guardar");
this.toolTip1.SetToolTip(this.pictureBox5, "Consultar");
datos cn = new datos();
cn.conec();
sCn = cn.cadena;
conn = new SqlConnection(sCn);
}